FRDM-KE06Z UART0 code is not working

[lajithacs]

Kindly help me in testing UART0 of FRDM-KE06Z in transmitting a character. When the code is run no signal is coming out of UART0 transmit pin. code is attached. 

main.c

int main(void)
/*lint -restore Enable MISRA rule (6.3) checking. */
{
/* Write your local variable definition here */
uint8_t data;
uint8_t tx_array[]={0x06,0x02,0x03,0x04,0x05};
/*** Processor Expert internal initialization. DON'T REMOVE THIS CODE!!! ***/
PE_low_level_init();
/*** End of Processor Expert internal initialization. ***/
/* Initialization of SS1 component */
// Error = SS1_ReceiveBlock(MySPIPtr, InpData, BLOCK_SIZE); /* Request data block reception */

UART0_Init();
//SPI0_mstrInit();
for(;;)
{

UART_tx(0x55);

}

uart.c

void UART0_Init()
{

SIM_PINSEL0 |= SIM_PINSEL_UART0PS_MASK; //uart0 pin select
SIM_SCGC |= SIM_SCGC_UART0_MASK ; //Bus clock to the UART0 module is enabled
UART0_BDH =0x00;
UART0_BDL =0x4E; //Baud rate reg. value SBR[12:0]=0x004E 
//UART0_C1 =UART_C1_LOOPS_MASK|UART_C1_RSRC_MASK ; // Loop back enabled and single wire uart mode

UART0_C2 |=UART_C2_TE_MASK ; //Tx enabled

}

void UART_tx(uint8_t value)

{

// while (!(UART0_S1 & UART_S1_TDRE_MASK));
while ((UART0_S1 & UART_S1_TDRE_MASK) == 0);// wait if tx buf is full

UART0_D = value;

}

[mjbcswitzerland]

Hi

I don't see an error with the UART code.

As reference I have attached three firmware versions for the FRDM-KE06Z which you can load as reference to check the HW.

uTaskerV1.4.12_FRDM-KE06Z_UART1-115kB.bin - this uses the OpenSDA VCOM UART (PTC7 for Tx and PTC6 for Rx) connection to deliver a command line menu shell. After a reset there will be a message sent at 115200 Baud and later it will respond to inputs

uTaskerV1.4.12_FRDM-KE06Z_UART0-PTB-115kB.bin - same but using UART0 (instead of UART1) and the pins are multiplexed to PTB1 for Tx and PTB0 for Rx

uTaskerV1.4.12_FRDM-KE06Z_UART0-PTA-115kB.bin - same but using UART0 (instead of UART1) and the pins are multiplexed to PTA3 for Tx and PTA2 for Rx

I build these with the uTasker project using the defines

#define FRDM_KE06Z
#define DEMO_UART    1

,

#define FRDM_KE06Z
#define DEMO_UART    0
#define UART0_ON_A

and

#define FRDM_KE06Z
#define DEMO_UART    0

respectively.

Beware that on the FRDM-KE06Z board the UART0 UART pins are not connected to the connectors by default since they are used by other peripheral connections. There are zero-Ohm resistors to modify this if needed, therefore measure the Tx output directly at the processor pins to be sure that it is not a measurement issue.

Regards

Mark

http://www.utasker.com/kinetis/FRDM-KE06Z.html

[lajithacs]

Thank you Mark. It was a hardware issue. UART0 tx signal i checked at the connector, which was not coming there as you have mentioned. Now its working .

[kerryzhou · Accepted solution]

Hi Lajitha CS,

   Thank you for your root problem sharing.

   If your problem is solved, please mark the correct answer to close this question, thank you!

Have a great day,
Kerry

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